gen Iii Iv V8 Engines - bolts Main Beaering Caps - Photo 12005789

2. The LS2 block is a four-bolt main style which means there are four bolts holding the main bearing caps of the crank. However, these engines are sometimes referred to as six-bolt mains due to the additional two side bolts which come in from the outside of the block for added block stiffness and low-end strength. Though the block is aluminum, the main caps are steel, which helps in the longevity of the engine.